cheney



F. CHENEY.

Pand Oct. 25, 1921.

SOUND REPRODUCINGAMACHIHE. APPLICATlou mio fia. la. 1919.

SHEETS-suiv l.

F. CHENEY.

SOUND REPRODUCING MACHINE.

2 SHEETS-45H11! 2A PPLICION FILED FEB. I3. l9l9.

Patented Oct. 25, 1921.

UNITED STATES FTENT OFFICE.

FOREST CHENEY, OF'CHICAGO, ILLINOIS, ASS-IGNQR TO CHENEY TALKING MACHINECOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

SOUND-REPRODUCIN MACHINE Specification of Letters Patent.

Patented oet. 25, 1921.

Application led February 13, 1919` Serial No. 276,712.

To @ZZ 'wlwm z'tmay concern:

Be it known that I, FOREST CHENEY, a citizen of the United States,residin at Chicago, in the county of Cook and tate of Illinois, haveinvented certain new and useful Improvementsin Sound-Re roducingMachines, ofwhich the following 1s a specilioation.V

This invention relates to sound reproducing machines and moreparticularly to'an improved sound amplifier therefor.

s is Well known to those skilled in the art, While the initialvibrations ofthe diaphragm of such' machinrespotentially setup all Vofthe complex4 air vibrations'nessary toreproduce the fundamental tonesand overtones going "to" make u `the character and tone 'colorof'therecor edsound of instruments or voices, 4said air vibrationsarenevertheless ve weakandrmust be amplified and strengthened in order'that the recorded Asounds will be developed and reproduced insuiii'cient'volume.

I have discovered thatY the Avolume of sound which can be reproduced bya sound box and' tone arm of a 'ven size may be greatly increased`byf'con ucting the sound Waves from the vtone arm throughacubicaldistributing chamber' and 'therefrom 4by a plurality of'outlets the areaof each of which is less than thev area of the cubical chamber, theeffect ofl this 'arrangement being to control'the soundby providing aslightly restricted aperturefrom the cublcal chamber to the outlet. Iprefer to employ such a chamber in combination ywith a plurality ofamplifiers each comprising a mechanical throat, orchestral sections anda violin resonator such as described in Letters Patent-of the UnitedStates No. 1,170,800 andNo. 1,170,801, granted to me on February 8,1916.

One of the objects of my invention is to provide a talking machine witha plurali@l of amplifiers so constructed and arranged as to increase, ina novel manner, the volume oi' the reproduced sound.

Another object of my invention is to provide atalking machine With adistributing or tone chamber into which the sound is delivered from thet -ne arm and from which it is directed through a plurality of outlets,which outlets are in. connection with the usual amplifiers orresonators. The distributing chamber` which I have found most desirablefory the proper reproduction of sound is afcubical one, and it is withthe cubical chamber that the outlets communicate.

These andA other objects of my invention are accomplished by providing asound reproducingmachine having `a distributing chamber, a plurality ofresonators and connections between-*the distributing chamber andresonators comprising orchestral sections 'and'mechanical'throats In thedravv'imgg'sz'd f Fi re 1 isa horizontal sectional view onjllne'lT-l of-Fig. "-2,"shovving the preerred embodimentof my invention, Fig.l22 is:a sectionabview 'onv line`2-2 of Fig. 1,

t ig. 3 is a section on line 3 3 of Fig. 1, Id`ig. 4 is a sectiononlin'e 4 4 of Fig. 2,

` `7 H Uril' l VFi 5 is a section on line 5-5 of Fig. 1.`.Thlsginvention is an improvement over that shown 'and described' in mycopcnding applicaion Serial No. 185,659, filed August 11'191."'

In orderwto reproduce sound which is pleasing to the ear and which maybecarrie'da relatively great distance, for example, in a-co'ncert hall, itis necessarythat the volume, as distinguished from mere loudness of thesound reproducing machine be suiiciently great. This involves thedevelopment and reinforcement of theY sound waves initiated by thediaphragm so that the recorded Sound may be faithfully rcproduce'd anddelivered uniformly throughout a large space, Without having to use avery large machine. 4

I have illustrated my invention in connection with a sound reproducingmachine preferably of the cabinet type, this invention being adapted tobe conveniently mounted in thecabinet below the top thereof as is usualin this type of instrument. The parts of the present invention arepreterably made ofA resonant Wood rather than of metal as the tones ofreproduced sound developedthrough resonant wood conduits and amplifiersis fuller andmore pleasing than that reproduced through metal conduits.My invention comprises aconduit or distributing chamberv 10 preferablymounted in a vertical position, the upper end of which is adapted toreceive the end of a tone arm which may be of thestyle 'shown in PatentNos. 1,170,801, and 1,170,802, granted to me February 8, 1916. However,as the tone arm connection does not form part of my invention I'shallnot describe the same here. The conduit 10 for. .the greater part of itslength is bored as at 11, the cross section thereof being circular. Thebore 1l terminates in a cubical Asound distributing chamber 12 the crosssectional area of which is slightly greater than the cross sectional-area of .the -bore 11. C0n nectedwith the=distributing chamber l2 andextending therefrom on leach side are the conduits 13, 14, the crosssection of which is and of -less areai'than 'the cross section o fthechamber .12, end the axes .of which ,ane preferably lin the.samefstrai ht line. .Thelcondiuits 1B, 14,'have-thecircu ar boredlportions 15 terminating substantially eubica1 =chamhers,-1;6, whichfcommunicate with mechanicalihroatsf 17 similar to those disclosed in myPatpntflilo. 1,170,801. Communieatiuggvyith 'the throats 17am a Series.of orchestral-.omhels 18, 19., Vpreferably offthetype shown in any.Batent No. 1,170,800,.and .communicating with the 'endmost orchestralsections 19 are the violin resonators .20 which resonators anelpveerably lof the typefshown .in.l.11Y-z Patenti No. 1,170,800. I havefound by experiment that the volume. of .sound reproducing; machines maybe seatlfy;.,fncreasedf for-developing fuller.an nicher I tones byconnecting 5 the tone .arm with a `plurality -of amplifiers ofsubstantially the construction herein disclosed. The cross sectional.areas of the various conduits vary. In theerrangement shown hereinfthecross-sectional'area of the cubical-distribpting chamber .12;at thelower end of .the conduit :1 0 is-greater-than'the cross sectional areaof'the vbore -1'1 in said conduit. The cross Asectional areaof the bore15 of the conduits 1 3, v14, is lessthan the cross sectional area of thechamber 12, and the cross sectinnal area of the cubical chambers 1G isgreater .than the cro sectional area of the bor i15. Itfwill be notedthat I have provided a 4plurality of openings through `which the .soundWaves travel which openings are of .dierent shapes and sizes. Because ofthe fact that the con duits are of resonant` wood and itogether with the.provision of the conduit openings being of various sizes and forms, itis possible to so develop thesound `waves as to deliver at the endsofthe resonators repro duced sounds which are ,as-free of mechanicaleffect as it -is possible to=make such sounds The .efeot of ftheplurality of amplifiers comprising the ,parts described is an increase4of the Jvolume .of the reproduced sound while maintaining-tlm quality,fullness, richness and the .tone of the recorded sound. Itis to notedthat .in the disclosure .shown herein have showname .dis-

tributer l2 :is being provided with but two sound outlets 13, 14.However, it is understood that this number maybe increased if desiredwithout departing from the scope oi' mv invention.

n employing my invention I have found vthat the volume of the soundreproduced in a machine having a plurality of outlets is greatlyincreased over that reproduced b v a machine having but a single outlet,the needle. sound box and tone arm of each machine being the same. Withthis arrangement, especially with the 'restricted orifice inthe'distributingr chamber through which theA sound waves flow to theoutlets and where the outlets communicate .with a single chamber, agreatly increased volume of sound is delivered, the needle scratcheseliminated and .the sound Yreproduced in uni son. -Apparently the.vibrations of -sound in the cubical chamber `are dissipated evenly'through each Aof the outlets, 4as the delivered sound in'xteach outletis exactlydzhe same as the-soundn-iitheother. Where a soundconduit-isemployed 4leading trom the tone arm to ,reach of -a ,pluralityof outlets without aldistributing chamber, the sound delivered isnot inunison and the volume is not incneased.A i

Q*{While I .have described more .or less precisely fthe jdetailsofconstruction` I do not wish to .bei understood :1s-limiting myselfthereto, as I contemplate -changes in form and-the proportioncf ,partsand the substitution of equivalents .as circumstances may suggest orrender expedient, Without de partingr from the spirit of my invention.

l. In a'sound reproducing machine, in combination. asuhstantiall)1cubical distributing chamber, a sound conduit leading 4"to said chamber.a plurality-of conduits each connected-with said distributingr chamber,each conduit y'having an opening therethrough of a.' plurality of shapessymmetrically arranged with respect to a transverse plane through themiddle of the conduit, 1and resonators in communication with the ends of.the conduits.

2. In a sound reproducing machine, in combination, a substantiallycubical distributing chamber` a sound conduit leadingr to said chamber.a pluralityT rof conduits each connected Vith said distributing chamber,each conduit having au opening therethrough of a plurality of shapesSymmetricallv arranged with respect to a transverse plane through th'emiddle of the conduit, a mechanical throat in communication witheach'conduit, resonators, and orchestral sections between the .throatandresonators.

- 3. In asound reproducing machine1 in combination, .a distributingchamber having a cylindrical central opening terminating .in asulostantiallx.T cubical portion, a plurality izo of conduits connectedwith the cubical portion of said distributing chamber, each conduithaving an opening therethrough of a pluralty of shapes symmetricallyarranged with respect to a transverse plane through the middle of theconduit, and resonators 1n communication with the ends of the con duits.

4. In a sound re roducing machine, in combination, a distri utingchamber having a cylindrical central opening terminating in asubstantially cubical portion, a plurality of conduits connected withthe cubical portion of said distributing chamber, each conduit havin anopening therethrough of a plurality o shapes symmetrically arranged withres ect to a transverse plane through the mid le of the conduit, amechanical throat in communication with each conduit, a resonator, andorchestral sections between the throat and resonator.

5. In a sound reproducing machine, in combination, a vertically disposeddistributing chamber having a cylindrical central opening terminating ina substantially cubical portion, a plurality of horizontally disposedconduits connected with the cubical portion of said distributingchamber, each conduit having an opening therethrough of a plurality ofshapes symmetrically arranged with respect to a transverse verticalplane through the middle of the conduit, and resonators in Comunicationwith the ends of the conduit.

6. In a sound reproducing machine, in combination, a vertically disposeddistributing chamber having a cylindrical central opening terminating ina cubical lower portion, a plurality of horizontally disposed conduits,each connected with the cubical portion of said distributing chamber,each conduit havin an opening therethrough of a plurality of s apessymmetrically arranged wlth respect to a transverse vertical planethrough the middle of the conduit, a mechanical throat in communicationwith said conduit, resonators, and orchestral sections between thethroat and resonators.

Signed at Chicago, Illinois, this 11th day of February, 1919.

FOREST CHENEY.

